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Monthly Archives: February 2015

The Regulation of Circulation (Heart, Neurohormons, Local)


Heart is innervated by both sympathetic and parasympathetic divisions of the autonomic nervous system. Release of norepinephrine from postganglionic sympathetic nerves activates β1-adrenoceptors in the heart, notably on the sion-atrial (SA) node, atrioventricular (AV) node, His-Purkinje conductive tissue, and atrial and ventricular contractile tissue. In response to stimulation of sympathetic nerves, the heart rate (chronotropy), rate of […]